Suggested by General Electric in a 1970 document, this circuit uses a LASCR, or SCR fired by light. This component is uncommon today.
This circuit uses a thermistor or NTC as a temperature sensor and provides the indication on an...
In the figure below we have a typical circuit for applying a current sensor that can be used in...
Found in an Electronics World of 1968, this circuit is indicated for applications in photography...